Martin Yale 1" Roll Tabs for EX5100 Tabber These rolls of tabs are designed for use with your Martin Yale EX5100 tabbing machine. Each tab is 1" in size and each roll of tabs contains five thousand tabs. Using these tabs along with your Martin Yale Intimus tabber, you can seal mail pieces to create mailings that comply with USPS postal requirements. That means you can reduce the cost of mailings by eliminating the need for envelopes. Consider using these Martin Yale tabs for your next tabbing project.